- Category:
- SCM
- Tags:
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[WORD]
- File Size:
- 3.75kb
- Update:
- 2008-10-13
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- Uploaded by:
- yangssss888
Description: AT89C51 single-chip 2KHz the square wave generated by its port P3.2 output, when the square wave for a wave crest, it is NPN-type transistor conduction, horn-driven sound, when its trough, then the transistor cut-off, speakers not to issue voice.
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